Also, as a general rule of thumb, if you're lighter you're putting less pressure on the ice, so you tend to need a smaller hollow (more bite), while if you're heavier a small hollow results in excess bite and too much friction, so a shallower hollow tends to work better for heavier skaters. But then there's just personal preference too, Paul Coffey for example was not particularly big but used ridiculously shallow hollows, up to 2", which is basically unheard of.